Soil-Cement Column (SCC) is a semi-rigid structure of which quality could not be thoroughly assessed by non-destructive tests such as Impact Echo, Impulse Response, Impedance Log, Parallel Seismic, etc. Unlike concrete piles as rigid structures, the problem of SCC is due to its relatively low stiffness and inhomogeneity. The reason in the process of mixing at the site, re-using the in-situ disturbed soil, and conducting to the deep zones of the soil stratum, the product faces so many risks of questionable quality. Because the structure is semi-rigid, the method of using electrical resistivity (ER) in geophysics is suggested. This article deals with an experimental model in which an axisymmetry SCC with a sufficiently wide soil medium is created for measuring the ER, having electric probes installed in a Wenner and Schlumberger configuration. By tracing the change of electric resistivity (ER) within the structure having different stiffness, and comparing the ER map of the homogeneous soil medium before and after cemented treatment, between non-defective and defective structure, etc., the change in mechanical properties of the structure is predicted quantitatively. The bearing capacity of the structure could be then estimated by applying formulas in traditional calculations. The results of the bearing capacity of a soil-cement column calculated would be compared to those predicted by the artificial neural network (ANN) and tests in a small-scale model. The model which uses ER in predicting the bearing capacity of a semi-rigid structure indicates a quantitative tool in geotechnical engineering.
Keywords: Soil-cement Column, Wenner Test, Schlumberger Array, Electric Resistivity.
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